A Method to Design Dual-Band, High-Directivity EBG Resonator Antennas Using Single-Resonant, Single-Layer Partially Reflective Surfaces

A new method is presented to design dual-band, high- directivity, EBG-resonator antennas using simple, single-resonant, single-layer partially re∞ective surfaces (PRS). The large, positive gradient of the re∞ection phase versus frequency curve of partially re∞ecting surfaces, observed only close to the resonance frequency of the PRS, is exploited for this purpose. An example single-resonant PRS, based on a frequency-selective surface (FSS) composed of a printed slot array, was designed. Then it is used to design an EBG- resonator antenna to demonstrate the feasibility of achieving dual-band performance. Cavity models are employed, together with the re∞ection characteristics of the PRS, to understand the operation of the device at critical frequencies such as cavity resonance frequencies and the PRS resonance frequency. Antenna simulations and computed results conflrm the dual-band operation of this very simple, single-layer, low- proflle EBG-resonator antenna. It resonates in two bands centered at 10.5GHz and 12.3GHz. The peak directivity in each band is 18.2dBi and 20.5dBi, and the 3dB directivity bandwidth of each band is 7.5% and 8.7%, respectively.

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